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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 4,303 $ 3,719 $ 8,882
Charged to Costs and Expenses 3,635 2,126 557
Other 0 0 (4,649)
Deductions (1,499) (1,542) (1,071)
Balance at End of Period 6,439 4,303 3,719
Deferred tax assets valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 12,069 6,973 7,961
Charged to Costs and Expenses 1,617 3,848 (894)
Other 0 1,291 0
Deductions 139 (43) (94)
Balance at End of Period $ 13,825 $ 12,069 $ 6,973